Cytological observations on the dedikaryotization process in C. velutipes and mating type analysis of the dedikaryotized oidia were done with the results confirming the Brodie's. report (1936).
A new convenient way for comparative studies in cytoplasmic and nuclear influences by means of the dedikaryotized oidia is suggested (Fig. 16).

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Amylases of the digestive fluid and of the mid-gut tissue extract in the fifth-instar larvae of N-115 and of ae-2 strain of the silk worm, Bombyx mori, were extracted and concentrated by precipitation with acetone and ammonium sulfate. Their activities were compared as follows:
1) The amylase activity of the digestive fluid of N-115 larvae was fifty times higher than that of ae-2 larvae, while its activity of the mid-gut tissue extract of N-115 larvae was shown to be only five times higher than that of ae-2 larvae.
2) The optimal pH for amylase activity of the digestive fluid of N-115 larvae was shown to be 9.2, that for the mid-gut tissue of N-115 larvae being 9.8.
3) The paper chromatography of amylases in the digestive fluid and the mid-gut tissue of N-115 larvae was performed. Amylases were developed by 5-10% acetone, but the treatments with sodium chloride, ammonium sulfate and phosphate buffer (pH 9.6) failed in the attempt. The Rf values of amylase in the digestive fluid were 0 and 0.66, while those in the mid-gut tissues being 0, 0.44 and 0.61.
4) The histological observations of the mid-gut tissues in the fifth-instar larvae of both N-115 and ae-2 strains were carried out. Many secretory granules were observed between the striated borders and the peritrophic membranes of the mid-gut tissues not only in N-115 but also in ae-2 strain. The granules in the fifth-instar larvae seem to be increased in numbers and volumes after three days.
According to the above results, we can assume that the amylase seems to be secreted from the mid-gut tissue of both N-115 and ae-2 strains, but its activity in the digestive fluid is varied when amylase passes through the peritrophic membrane. The difference of amylase activities in the digestive fluid between N-115 and ae-2 strains is supposed to depend on the secretory amount of amylase and on the permeability of the striated border.

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Dormant seeds of Triticum monococcum were exposed to ultra short electric waves. Impulse waves were applied (wave length 10m) to remove the heat effect, at 5, 100V, 10mA current and about 8cm distance. Few chromosomal irregularities were observed in the meiosis of the treated plants (S₁-generation). Among the progeny (S₂) obtained by selfing of the S₁-plants, however, there were found some dwarf plants, which had about half the height of normal plants and were highly sterile. In the next generation (S₃) of the sister plants of the dwarfs, again some sterile dwarfs appeared, but their height and fertility were somewhat improved. Crossing of these dwarfs with T. monococcum and aegilopoides was unsuccessful. In the S₄-generation recovery of fertility and plant height wass further considerably increased and at last, in the S₅-generation no dwarf could be found. The mechanism of these phenomena awaits further investigation.

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1. 同質四性体稲の5品種について育成後第8代までの種々の世代における稔実率, 稈長及び出穂月日の個体間変異を観察した。一般に四倍体稲の個体間変異の幅は二倍体の個体間変異よりも大きいようである。
2. 前代のある1個体から得られた個体群を系統として, 上記の各形質の系統間変異を系統内個体間変異と比較すると, 系統間バアンスが統計上有意義である場合が多い。又前代の個体の測定値と次代系統の平均値の間に弱い相関が存在する場合が見出される。従つて個体間変異の一部は遺伝的であると考えられる。
3. しかし個体間変異は毎世代常に発生するため, 淘汰は無効のようであり, 多数個体の平均値は二倍体の場合同様に品種に固有の特性であることが認められた。又世代の経過に伴う稔実率の上昇は見出されなかつた。

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From calculations on the standpoint of genic equilibrium, authors obtained the following results; diathesis of susceptibility to tuberculosis is inherited by two recessive independent genes a and b, a is of severe illness, of which the homozygotes fall ill entirely, b is of mild illness, of which bb individuals fall ill with some genotypic morbidity α. The frequecy of aa is 0.044 and that of bb is 0.21.

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1. 種内における花粉管の伸長度を比較すると, 3種とも柱頭における花粉管の伸長度が最大を示し, 花柱, 子房という順位を示す。この伸長度の差異を齎す物質即ち自家不親和性の原因とされている抑制物質の如き物質が南瓜属において影響を及ばす。
2. 花粉管伸長度を抑制する物質を調査すると, 開花2日前に子房内において抑制物質が形成され, 上部に移動を始め, 開花1日前には柱頭上に集る。これが開花当日, 柱頭においてある種のホルモンが形成されるためか, (授粉の刺戟による Wund-Hormon の形成と考えられ) 又は抑制物質の效果が減少する為かにより, 交配の場合は殆んど影響がなくなる。
3. 抑制物質は開花当日においても形成されつゝある。
4. 柱頭切断区の切断面に人工的植物ホルモンを添加して授粉させたころが, 完全区とほぼ同様な伸長を認めた。よつて開花当日柱頭において, 一種のホルモンが形成され, 花粉管伸長を促進するものである。

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